Low-pressure alarm.



W. E. VOSS.

Low PRESSURE ALARM.

APPLICATION FILED APR. IO. |916- 1,300,523. Patented Apr. 15,1919.

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ATTORNEY.

kVTIIILIIAIVI E. VOSS, OF OKLAHOMA, OKLAHOMAa VLow-sanssuits ALARM.

Speciication of Letters Patent.

Patented Apr. 15, 191e.

Application led April 10, 1916. Serial No. 90,184. v l

vThe object of the invention is to provide means for giving a signal when the pressure in a train-pipe is too low. The V'acco'mpanyil'lg drawings show one form in which the invention has been put in actualrpractice.

. [Figure 1 is any elevation view .showing a portiono atrain-pipe and showing the 1n-4 ventionin use thereon.

Fig. 2 is an enlarged view, mostly 1n section, showing the position of the parts ot the J invention when the train-pipe vis under normal pressure.

Fig. 3 is a'fragment'al View, mostly in sec-l tion, showing the Aposition of the yparts when the pressure has been reduced. Y f

Fig. 4 is a similar view showing the. posi? tion of the parts after further reduct-ion of the pressure. Y'

All the views are taken in the same direction, and like charactersof reference designate like parts in all of them.

w The numeral 5 designates the vtrain-pipe of a car. Y

A cylinder 6 is placed in communication with the train-pipe 5 by a pipe 7 The cylinder 6 is fitted with a piston 8 whose rod 9 extends upward and slidably through a sleeve 10, the latter being screwthreaded through the upper end 11 of the cylinder.

For convenience in construction and assemblage of parts, the upper end 11 of the cylinder 6 screws removably into place.

A compression helical spring 12 which embraces the rod 9 is interposed between the sleeve 10 and piston 6*, and acts yieldably to force the latter downward in oppositionk p to the pressure from the tra n-pipe 5.

The cylinder 6 is so arranged that when the piston 8 is at an intermediate point of its full throw the air may by-pass it upward and operate a suitable alarm.

1n arranging for this `luy-pass of air, a

port 13 in the vform of a groove maybe provided on the innersurface of the cylinder 6 and made longer than the piston 8.

The alarm may be in the form of a whistle 14 which forms an outlet from the cylinder 6 above the piston 8 and is sounded by escaping air. p

With the train-pipe 5 under normal pressure the piston-8 is held to or toward the upper end of its throw in opposition to the spring 12 and covers the upper end of the port 13 as shown in Fig. 2.

1fv the pressure of the train-pipe continually reduced, the spring 12 will gradually force the pistonS downward until both ends of the port`Y 13 are uncovered, as.

shown in Fig. 3; and the air thus allowed to by-pass the piston 8 sounds the .whistle 14.

A further reduction of pressure allows vthe piston 8 to be forced further downward by the spring 12 and cover the lower end of the port 13invthe position shown in Fig; 4, thus stopping the by-pass of air and the sounding the pressure to zero. v v

i/ith the parts of the device arranged and operating'l as shown and described, the ,motorman is not only warned of reducing pressure at a point intermediate full normal pressure and zero,'buty when the compressor or other means of raising and maintaining air pressure begins .to work,l theA increasing upward against the action of the spring 12 until both ends of the port 13 are again uncovered, the air againI escaping through the port 13 and through 4the whistle 14 and indicating that compression is taking place.

The further increase of pressure toward normal raises the piston 8 to where it covers the upper end of the port 13 and stops the sounding of the whistle 14; and since it is not necessary that the piston move farther upward any suitable means for limiting movement of said piston may be provided, for example the spring 12 in its fully comressed position shown in Fig. 2.

The outlet opening of the whistle 14 should be enough larger than that of the port 13 to prevent setting up of a balancing pressure above the piston 8.

The upper end of the rod 9 may be provided with. a, knob 15, and by an occasional of the whistle 14 during the lowering ofV 7sl Y pressure graduallyY raises the piston 8 back` p downward blow on this knob by the hand a n'iotorman or engineer may keep'lthe piston 8 from' becoming stuclfin the 'cylinder 6;

'Having thus described the invention, I claim l. The conbination'witl a l'ii'idpessire" container, of a cylinder having-7.*enef,end.A

thereof in communication with .the container, a'sleeve: adjustably'. threaded inthe head"at"the opposite end of the cylinder, a

ton rigid with the Vpiston rod and slidable within' the cylinder, the interiorof the cylindebeing-fformed at one side tliereof'with a by-pass--of'whic-h the end Vportionscomnuinicatey with the cylinder at points spaced 5 apart a"gr'e'ate'r amount" than the thickness ofthe' pistomand a spring `surrounding vthe piston rod and interposed between the 'sleeve andl "thle' piston', said spring tending -to move thef piston 1/ against the air pressure andthe tensionof the spring being' adjustable'` by manipulating the beforementioned sleeve, a lateral discharge openingl being-frv formed infthat enfdof the cylinder Yrenno'te from-'the aI greater distance thanv the' thickness of' the piston', ajlateral discharge -opening having a"'whistle formed in connection therewith heingfprovided in that end of the" cylinder escape of remote from the connection of the cylinder withthe pressure container, yandra spring surrounding the) piston rod and` actingmpon the piston to move it against the air pressure. Y 3. The combination. .with a fluid pressure container, of a cylinder having one end thereoffin communication with Y the con-V tainer, a'piston rod slidable through the oppositerend of the cylinderea piston mounted within the cylinder and"c()unec'ted to th'e pistoni-rod, Vthe interior ofthe cylinder being provided at one side thereof with Y a bygpass of whi'ch"the' ends communicate withthe-cylinder?at pointsl sp'az'e'd apart a greater' distance thanEN the i thickness off the pistori;A aff springnornially ftendinglfto move;V

theff nifston-agaii-'ifst the' air pressure, Ythe-"end with thfe 'container 1bei'nf'g forined ywith t'dischargei opening-,5- means actuated escape of airthrough -the 'clischarge-operring tl'iey -pistoirrod forfpreve'nting! sticking offthe piston within the cylinder. 'i 1 1 A 41. Thetcomfbination with' a uidfpressur containerv orfl a i cylinder' placed in l communi-f cation therewith, apiston mountedfwithvm they",` cylinder," a f pistonv i rod .j connected"` with Y the piston i and flproj ecting- "exteriorly kof Mthe cylinder, yielding l meansi tending: to move thepistonin opposition to the?V pressure within fthe container, i mea-nsfforv vcausing the fluid to' passaround 4fthe pistoniand'factuate' an alarm when the piston 1s broughtfftowaf predeteiunined point: inw the cylinder, and a knob on' the piston fior; ymanually moving the piston to prevent' stickingVv tliereorina the:

cylinder.v i

- lit-nes'sl'my hand this 5 dayl of April; 1916.

Washington, D. G. 

